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Fencer Intel
high 7.8

CVE-2026-98320 json

netfilter: flowtable: hold reference on ct until flow is released

published last mo. modified 23d ago also EUVD-2026-93305

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 3%
public exploits
0
none known

Summary

In the Linux kernel, the following vulnerability has been resolved:

netfilter: flowtable: hold reference on ct until flow is released

nf_ct_put() releases the ct->ext area inmediately, the rcu typesafe semantics also allow to refer to the wrong conntrack from the flowtable datapath. Hold reference on ct until flow is released after rcu grace period.

Add rcu_barrier() on module exit path, to ensure pending flow entries are release before module goes away.

Patch / fix

  • Linux Linux 7.3
  • linux Debian 12 6.1.190-1
  • linux Debian 13 6.12.113-1
  • linux Debian 14 7.2.8-1
  • linux-6.12 Debian 12 6.12.113-1~deb12u1

debian advisories DEBIAN-CVE-2026-98320

  • linux Ubuntu 22.04 LTS 5.15.0-202.212
  • linux Ubuntu 24.04 LTS 6.8.0-149.149
  • linux Ubuntu 26.04 LTS 7.0.0-42.42
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1119.126
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1069.74
  • linux-aws Ubuntu 26.04 LTS 7.0.0-1016.17
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1120.130
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1073.81

ubuntu advisories UBUNTU-CVE-2026-98320

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • kernel RHEL 8 4.18.0-553.176.1.el8_10
  • perf RHEL 8 4.18.0-553.176.1.el8_10
  • bpftool RHEL 8 4.18.0-553.176.1.el8_10
  • kernel-core RHEL 8 4.18.0-553.176.1.el8_10
  • kernel-tools RHEL 8 4.18.0-553.176.1.el8_10
  • python3-perf RHEL 8 4.18.0-553.176.1.el8_10
  • kernel-modules RHEL 8 4.18.0-553.176.1.el8_10
  • kernel-zfcpdump RHEL 8 4.18.0-553.176.1.el8_10

red hat advisories RHSA-2026:85773RHSA-2026:85774

  • kernel-source openSUSE Tumbleweed 7.2.10-1.1

opensuse advisories openSUSE-SU-2026:12131-1

  • kernel AlmaLinux 9 5.14.0-687.61.1.el9_8
  • rv AlmaLinux 9 5.14.0-687.61.1.el9_8
  • perf AlmaLinux 9 5.14.0-687.61.1.el9_8
  • rtla AlmaLinux 9 5.14.0-687.61.1.el9_8
  • libperf AlmaLinux 9 5.14.0-687.61.1.el9_8
  • kernel-rt AlmaLinux 9 5.14.0-687.61.1.el9_8
  • kernel-64k AlmaLinux 9 5.14.0-687.61.1.el9_8
  • kernel-core AlmaLinux 9 5.14.0-687.61.1.el9_8

almalinux advisories ALSA-2026:90365ALSA-2026:85773ALSA-2026:85774

  • kernel Rocky Linux 9 5.14.0-687.61.1.el9_8.cloud.1.0
  • kernel Rocky Linux 9 5.14.0-687.61.1.el9_8
  • kernel-rt Rocky Linux 8 4.18.0-553.176.1.rt7.517.el8_10
  • kernel Rocky Linux 8 4.18.0-553.176.1.el8_10

rocky linux advisories RXSA-2026:90365RLSA-2026:90365RLSA-2026:85774RLSA-2026:85773

  • kernel Azure Linux 3.0 6.6.158.1-1

azure linux advisories AZL-106083

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-98320 updated cvss 7.0

kernel: netfilter: flowtable: hold reference on ct until flow is released

  • Red Hat Enterprise Linux 9 kernel-rt, kernel-rt-kvm, kernel-rt-core, kernel-rt-modules, kernel-rt-debug-kvm, kernel-rt-debug-core, +12 more Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8
    affected: workaround, no fix available
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-687.61.1.el9_8, rv 5.14.0-741.20.1.el9_9, perf 5.14.0-687.61.1.el9_8, perf 5.14.0-741.20.1.el9_9, rtla 5.14.0-687.61.1.el9_8, rtla 5.14.0-741.20.1.el9_9, +20 more
    fixed: vendor fix RHSA-2026:90365
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-264.14.1.el10_3, perf 6.12.0-264.14.1.el10_3, rtla 6.12.0-264.14.1.el10_3, python3-perf 6.12.0-264.14.1.el10_3, kernel-devel-matched 6.12.0-264.14.1.el10_3, kernel-64k-devel-matched 6.12.0-264.14.1.el10_3, +7 more
    fixed: vendor fix RHSA-2026:98608
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-553.176.1.el8_10, kernel 4.18.0-553.176.1.el8_10, bpftool 4.18.0-553.176.1.el8_10, kernel-core 4.18.0-553.176.1.el8_10, kernel-tools 4.18.0-553.176.1.el8_10, python3-perf 4.18.0-553.176.1.el8_10, +15 more
    fixed: vendor fix RHSA-2026:85773
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-687.61.1.el9_8, kernel 5.14.0-741.20.1.el9_9, kernel-64k 5.14.0-687.61.1.el9_8, kernel-64k 5.14.0-741.20.1.el9_9, kernel-core 5.14.0-687.61.1.el9_8, kernel-core 5.14.0-741.20.1.el9_9, +60 more
    fixed: vendor fix RHSA-2026:90365
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-264.14.1.el10_3, kernel-64k 6.12.0-264.14.1.el10_3, kernel-core 6.12.0-264.14.1.el10_3, kernel-tools 6.12.0-264.14.1.el10_3, kernel-modules 6.12.0-264.14.1.el10_3, kernel-64k-core 6.12.0-264.14.1.el10_3, +28 more
    fixed: vendor fix RHSA-2026:98608
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-687.61.1.el9_8, libperf 5.14.0-741.20.1.el9_9, kernel-debuginfo-common-s390x 5.14.0-687.61.1.el9_8, kernel-debuginfo-common-s390x 5.14.0-741.20.1.el9_9, kernel-debuginfo-common-x86_64 5.14.0-687.61.1.el9_8, kernel-debuginfo-common-x86_64 5.14.0-741.20.1.el9_9, +4 more
    fixed: vendor fix RHSA-2026:90365
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-264.14.1.el10_3, kernel-debuginfo-common-s390x 6.12.0-264.14.1.el10_3, kernel-debuginfo-common-x86_64 6.12.0-264.14.1.el10_3, kernel-debuginfo-common-aarch64 6.12.0-264.14.1.el10_3, kernel-debuginfo-common-ppc64le 6.12.0-264.14.1.el10_3
    fixed: vendor fix RHSA-2026:98608
show 10 more
  • Red Hat Enterprise Linux CRB (v. 8) kernel-debuginfo-common-x86_64 4.18.0-553.176.1.el8_10, kernel-debuginfo-common-aarch64 4.18.0-553.176.1.el8_10, kernel-debuginfo-common-ppc64le 4.18.0-553.176.1.el8_10
    fixed: vendor fix RHSA-2026:85773
  • Red Hat Enterprise Linux NFV (v. 8) kernel-rt 4.18.0-553.176.1.rt7.517.el8_10, kernel-rt-kvm 4.18.0-553.176.1.rt7.517.el8_10, kernel-rt-core 4.18.0-553.176.1.rt7.517.el8_10, kernel-rt-modules 4.18.0-553.176.1.rt7.517.el8_10, kernel-rt-debug-kvm 4.18.0-553.176.1.rt7.517.el8_10, kernel-rt-debug-core 4.18.0-553.176.1.rt7.517.el8_10, +4 more
    fixed: vendor fix RHSA-2026:85774
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-687.61.1.el9_8, kernel-rt 5.14.0-741.20.1.el9_9, kernel-rt-64k 5.14.0-687.61.1.el9_8, kernel-rt-64k 5.14.0-741.20.1.el9_9, kernel-rt-core 5.14.0-687.61.1.el9_8, kernel-rt-core 5.14.0-741.20.1.el9_9, +34 more
    fixed: vendor fix RHSA-2026:90365
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-264.14.1.el10_3, kernel-rt-64k 6.12.0-264.14.1.el10_3, kernel-rt-core 6.12.0-264.14.1.el10_3, kernel-rt-modules 6.12.0-264.14.1.el10_3, kernel-rt-64k-core 6.12.0-264.14.1.el10_3, kernel-rt-debug-core 6.12.0-264.14.1.el10_3, +14 more
    fixed: vendor fix RHSA-2026:98608
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-687.61.1.el9_8, kernel-rt 5.14.0-741.20.1.el9_9, kernel-rt-core 5.14.0-687.61.1.el9_8, kernel-rt-core 5.14.0-741.20.1.el9_9, kernel-rt-modules 5.14.0-687.61.1.el9_8, kernel-rt-modules 5.14.0-741.20.1.el9_9, +15 more
    fixed: vendor fix RHSA-2026:90365
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-264.14.1.el10_3, kernel-rt-core 6.12.0-264.14.1.el10_3, kernel-rt-modules 6.12.0-264.14.1.el10_3, kernel-rt-debug-core 6.12.0-264.14.1.el10_3, kernel-rt-modules-core 6.12.0-264.14.1.el10_3, kernel-rt-debug-modules 6.12.0-264.14.1.el10_3, +5 more
    fixed: vendor fix RHSA-2026:98608
  • Red Hat Enterprise Linux RT (v. 8) kernel-rt 4.18.0-553.176.1.rt7.517.el8_10, kernel-rt-core 4.18.0-553.176.1.rt7.517.el8_10, kernel-rt-modules 4.18.0-553.176.1.rt7.517.el8_10, kernel-rt-debug-core 4.18.0-553.176.1.rt7.517.el8_10, kernel-rt-debug-modules 4.18.0-553.176.1.rt7.517.el8_10, kernel-rt-modules-extra 4.18.0-553.176.1.rt7.517.el8_10, +2 more
    fixed: vendor fix RHSA-2026:85774
  • Red Hat OpenShift Container Platform 4.22 rhcos 4.22.9.8.202611032353
    fixed: vendor fix RHSA-2026:95346
  • Red Hat OpenShift Container Platform 5.0 rhcos 5.0.9.8.202611022248, rhcos 5.0.10.2.202611022203
    fixed: vendor fix RHSA-2026:94537
  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.14% chance of exploitation in the next 30 days, higher than 3% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Linux Linux

Classification

Technology feeds

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.